Machine for presenting tubes to grinders



1. E. HOLBEIN.

MACHINE FOR PRESENTING TUBES T0 GRINDERfS.

APPLICATION FILED MAR. 5, I9I9.

Patented Oct. 14,1919.

' 5 SHEETS- SHEET l www n mk Q5 Ev HOLBEIN.

. MACHINE FOR PRESENTING TUBES TO GHINDERS APPLICATION FILED MAR. 5,|919.

Patented Oct. 14,1919.

5 SHEETS*SHEET 2.

Zafra/Ww? J. E. HOLBEIN.

MACHINE Foa PRESENTING TUBES To GRINDER'S.

APPLICATION FILED MAR. 5| 199.

Patented Oct. 14, 1919.

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WASHINGTON. D. c.

J. E. HOLBEIN.

MACHINE FOR PRESENTING TUBES T0 GRINDERS.

APPLICATION FILED MAR. 5| |919.

Patented Oct. 14,1919.

5 SHEETS-SHEET 4 .Till La PH C0., WASHINGTON. D. c.

1. E..H.0LB|N. MACHNE FOR PRESENTING TUBES T0 GRINDERSL APPLICATIONFILED MAR. 5. |919.

Patented yOct.. 14, 1919.

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MACHINE FOR PRESENTING TITIBES TO GRINDERS.

Specification of Letters Patent. Patented 'ctg 14, 1.919.vr

Application led March 5, 1919. ,Serial No. 280,687.`

To all ywhom t may concern.'

,Be it' known that I, JOSEPH E. HOLBEIN, a citizen of the United States,residing at Fombell, in the county of Beaver and State of Pennsylvania,have invented certain new and useful Improvements in Machines forPresenting Tubes to Grinders; and I hereby declare that the following isa full, clear, and exact description thereof, reference be ing had tothe accompanying drawings,

which form part of this specication.

This invention isa novel machine especially designed for presentingseamless steel tubing to a grinder so that it may be ground by suchgrinder to eliminate incipient seams or defects in the tubing prejparatory to further reduction in diameter of the tube.

The' invention includes novel means for longitudinally feeding a tubepast a rela` tively stationary grinder operating thereon, and forsimultaneously rotating the tube on its axis as it is fed longitudinallyiforward; also novel means whereby the speed of rotation of the tuberelative to its longitudinal travel canV be manually controlled andvaried as. desired; also novel means whereby the machine is adapted tohandle tubes ofvarying diameter; alsornovel means for imparting powercontinuously to the feeding units in whatever position they may beadjusted. The invention also includes various novel'features ofconstruction and novel combinations of parts as hereinafter explained.

In the Vmanufacture of seamless steel tubing the defects found in thetube blank after passing through the hot mill must be ground out beforethe tube is cold drawn on the benches. These defects are fine seams inthe blooms and billets, which when the billets are pierced, develop intolongitudinal circular or spiral seams of varying pitch and irregularity.

My novel machine is adapted, by reason of the flexibility of the feedingunitswhich are always under the control of the operator-to enable theoperator to bring the defects in the tube up to the `stationary grinderto be removed thereby in a facile and easy manner, and to lessen themanual labor required in grinding tubes, and enhance the speed andthoroughness o'f the grinding o erations.

While .t ie invention -is particularly def;

signed for' use in grinding tubes as stated? it could also be adaptedlfor rotating iods, or bars, etc., whileothe same are vbeing fedlongitudinally forward; and( while I shall hereinafter refer to theobject being treated as al tube I use such word ias a generic term toinclude tubes, rods, bars, andother objects which might be fedv suchmachine to Va grinder or other means or mechanism operating thereon. Ialso use4 the word grinder as a generic term to include any means ortool operatingupon such tubef while the latter is beinginanipulated bythe A machine.

'Io facilitate a comprehension of the invention I will explain in detailone practica] embodiment thereof-as illustrated in'thc l u A'accompanying drawings, but I refer to the claims for summaries of theessentials of the invention, the various novelffeatures of construction,and various novel combina# tions of parts for all of which I desireproteotion. It should .befunderstood, however,

that the invention is not restricted to the particular mechanism shownin the draw-v ings as when understood it maybe embodied in variousdesigns and forms of machines which co-ulddifer in appearance and specific elements from that illustrated vin the drawings while embodyingthe essentials of.

the invention.

In said drawings:V

Figure l is a top plan view of a complete machine for rolling or turningsteel tubing and the like while the same is being operated upon by avrelatively stationary grinder. Y

Fig. Q is a side view of Fig. 1 with the pipe removed. y

Fig. 3 is an enlarged transverse sectional view on the line 3 3, Fig. 2.

Fig. 4 is an enlarged partial side elevation i i showing the feedingunits adjusted to a different position from that shown in Fig. 1.

Fig. 5 is an enlarged detail sectional'view of one of the sets offeeding units.

Fig. 6 is an enlarged sectional View of the head of one of the piperetaining levers.

Fig.V 7 is an enlarged sectional view of one of the heads on line 7 7,.Fig. 5. Y

Fig. 8 is a detail-sectional view o`n line 8&8, Fig. 7. i

Figs. 9, 1o, 11,12 and leeft `clliiiag'ram:

matic views illustrating various positions 'of the feedin heads andvarious movements imparted t ereby tothe pipes.

The operative par ico iid

-s' of the machine may be mounted in a frame of any suitable make andform. As shown the frame may be mounted upon grooved Wheels 1b by whichit can be adjustably supported and guided on tracks 1c, so that themachine may be readily moved to the desired working position, kor to andYfrom the grinder, or moved out 0f the way when not in use. Suitablyjournaled in this frame is a main shaft '2, which extends longitudinallythereof, and may be driven at the 4-desired speed from any suitable.prime mover. In the machine shown the shaft 2 carries ,friction disks 2on` one end, which disks engage a `friction roller 3a slidably mountedon a vertical shaft 3, which is journaled in suitable bearings on `themain frame at one end thereof.

1n themachine shown the shaft 3 is Ageared toan electric motor indicatedat `and driven thereby, but instead of Vbeing geared to a motor theshaft may be driven either directly or Vindirectly from any othersuitable prime mover. The 'roller .3a may be adjusted radially .of thedisks 12 by a link 3b connected v to a hand lever 3C, which is providedwith a latch and segment of the usual kind to hold itin any desiredadjusted position. Such ikinds of friction drives are old, and form nofeature of the present invention; and any other suitable variable speeddrive may be used.

0n shaft 2 isla series of spaced bevel gears 2b that respectively meshwith Lbevel gears 4b on the lower ends of vertically disposed shafts Ll,which are journaled in suitable bearings at the rear of the frame. Asshown there are four such shafts l, and each shaft l .,is geared tooperate one pipefeeding vand `Vturning unit, oi' set of feeding heads.As these units, in the construction shown, are duplicates, anexplanation of one unitor set will explain all; similar letters beingapplied to similar parts 'in Vthe several units or sets.

l5.eferring` particularly to Fig. 3, each shaft ,-1- has on its upperenda bevel gear lu wh-ichineshes with a bevel gear 5a on a short shaft5, that is disposed horizontally or transversely of the frame andjournaled in suitable. bearings on the frame as shown. The inner endofshaft 5 is pivotally jointed to one end o'f a flexible or Vtelescopicshaft member 5b, the other end of which is pivot- .ally jointed to theinner end of a vstub shaft journaled in a bearing 7 a on the upper endof a casting 7. which is pivotally mounted upon the frame at the frontsidethereof.

Themeinber 'binay be -a`telescopic-shaft connection as rindicated in thedrawings, such connection {bei-ng well'known needs no specificdescription herein; and various other'flex'ible shaft connections wellknown in the art couldbe used to transmit rotary motion xtothe shaft 6from 'the shaft 5 and permit lateral displacement. of the shaft V6relatively vto the shaft The shafts 5 and 6 lie practically transverselyof the frame and in axial aliuement, but by reason of the flexibletelescopic connection 5b between the shafts 5 and 6, the shaft 6 iscapable of being moved laterally relatively to shaft while the rotativedriving connection between the shafts 5 and 6 is maintained by themember 5a.

As shown the casting 7 is rigidly connected to a yshaft 7b that is`journaled in a suitable `bearing 1'e on the front member of the frame;and said shaft may extend inward from the front bearing and have itsrear en d journaled in a bearing 1f in the frame; so as to firmlysupport the casting 7 while pern'iitting Vit to beswung laterally, andturn on or with shaft 7 b as its pivot.

On the front end of shaft 6 is a bevel gear i 6L which meshes with asimilar bevel gear 6b on the upper end of a stub shaft 6c, whichisvjorurnale'd Vin a forwardly projecting arm 'lc of the casting 7 anddisposed at right angles to the shaft 6. VOn the other end of shaft 6cvis mounted a feed head 6e which may jbe retained on the shaft by anysuitable means; being shown as retained thereon VVby mea-ns of a screwGf tapped into the end of the shaft 6c and Concealed in a hole in Ythecenter of the head. 6e.

'1t is desirable to have the A.head 6e connected to rotate with theshaft6C' but capable of a partial independent rotary motion thereon, for apurpose hereinafter explained. As shown the head 6e has an arc shapedslot 6g in its base opposite an annular flange 6h onthe shaft 6, and aball 6i is seated in av recess in the flange 6h and projects into theslot g and will permit a slight rotary inotion of theshaft 6c relativeto head 6e equ al to the length `of the slot .6g (see Figs. 7 and 8).However the shaft and head may be connected to have a limited amount ofrelative rotary motion in any other suitable and preferred manner.

Each shaft il also carries a bevel gear 1l i'ueshing with a gear 15 on astud shaft 15 suitably journaledl in the frame parallel with and belowthe shaft 5, and connected by an extensible or flexible shaft 15h .to astub Ashaft 16 `lournaled in the lower end 17L of a casting or bracket17. which is mounted upon the frame below and opposite the casting 7,preferably by means of a shaft 17D journaled in a bea-ring 1ex on theframe opposite and below the bearing 1e, and the inner end of the shaft17b may be journaled in a bearing 1, below and parallel with the bearing1f.y and suitably secured in the frame so as to support the cast.- ing17 firmly on the frame while permitting it to be swung laterally on orwith shaft 17b as aV pivot.

@n the front end of shaft 1G is a bevel gear 1 6 meshing with bevel gear16b on .and'each being operated alike the lower end of a stub shaft 16cjournaled forwarding and turnin a tube and with their operating devicesform a' feed unit or set.

In the machine shown there are four units or sets of such coperating andforwarding devices; each set being constructedl alike a andsimultaneously from the shaft 2.

The parts numbered 14, 143,15, 15a, 15b, 16, 16a, 16", 16e, l17, 17h,17C, etc., are practically identical in construction tothe parts 4, 4a,5, 5, 5136, 6a, 6b, 6e, 7, 7b, 7, etc., and therefore do not need a moredetailed explanation.

The heads 6e, 16e may be semi-spherical, conical, or tapered,- but Iprefer to make them semi-spherical as shown; and these heads may be ofeast steel, or any other suitable metal or` material that 4will be foundbest adapted to enable them toproperly engage and operate upon the tubeas hereinj after explained.

The tube to be treated is adapted to be held in frictional contact withthe faces of each pair of opposed heads 6e,-16e,by any suitable means,as indicated at T Figs.` 3, 4, and 9 -to 13.

A pressing or retaining member is provided adjacent eachpair of lfeedheads 6e,

16e, to hold the tube in Vfrietional contactwith such feed heads.` Theform and arrangement of this pressing member may be varied and anydesirable or suitable means may be employed for holding the tube infrictional contact with the feed heads.

In the machine shown each pressing or retaining member comprises a lever8 slid-- ably supported at its' lower end on a bracket attached to thefront of thev frame `belo-w the shaft 1K6, and shown as connectedtherewith by a pin and slot connection 8a, (see Fig. 3).. This retaininglever extends upwardly from its support toward the shaft 16, and is thencurved outwardly and up- 1 wardly and extends to a point slightly abovethe lower head 16e. -Below the shaft 16 the lever 8 passes through aslotted guide 9 attached to the front of the frame; which guide preventslateral movement of the lever but permits it to have a swinging oroscillating movement toward or from the isadapted to engage the Ysid-eof thetube as shown in- F ig; 5,".and hold the same-'against' theadjacent feedheads Y6", 16e; and may' be caused' lto engage and lholdthe tube against the heads by any suitable-means'.` As .shown a toggle18 hasone member pivotally' connected to thelever 8adjacent its lowerend and its other member is pivoted to the frame as shown. The knuckleofthe toggle is pivotally lconnected to the lower end of a link 18", thevupper end ofwhich is connected to :a crankarm 18C on a rock shaft 18d,suitably supported on Ithe main frame,and extending preferably to apoint adjacent the drive V`end of the machine. Shaft 18d can be providedwith a Vcrank handle 18e by which it can be rocked.

vWhen the crankl 18e is thrown to uppermost position the toggleV 18 willbe broken and the lower end of lever 8 moved Atoward the frame, causingthe'lever 8 to rock on the fulcrum bolt 9'?l and its yupper end to moveaway vfrom the tube T and thus release the latter. When ,the crank 18e'is thrown in position to extendthe toggle, as shown in Fig. 3, the lowerend of leverA 8 is pushed outwardly and thelever fulcrums on the bolt 9a'and its upper end contacts with the tube and holds the latter againstthe feed heads. The amount of pressure eX! erted'by the lever 8-on'ithetube, and 1resultant pressure of the tube against the feed heads isregulated by adjusting the bolt 9a. I To reduce'or'lessen frictionbetween theVv pressing lever 8 and the tube Tthe upper end of the leveris preferablyprovided with an antifriction contact device of any suit-gable construction. As shown in Figs."3`and 'y keep the roller 8e onavertical axis, or atl right angles to the tube T.' Preferablyantifriction'means, such as balls 8i, is'interposed between the base ofthe Vcasting 8f and the head of lever-8 so thatv the casting 8f vmayreadily oscillate on the bolt 8g and permit the roller 8e to ytiltslightly from a verticall position as may be required when the tube T inaddition to its longitudinal movement past the lever 8 is also beingrotated on its own axis. Thus the roller 8e can automatically adjustitself to suit the movements of the tube and hold the latter against thefeed heads with the least possible amount of retarding friction. Y i.

As shown eachunit'or set'of feed' heads is'provided with asimilarretaining device;

alike, similar kparts being indicated by similar reference numerals,furtherY illustration and explanation thereof is unnecessary; Y

above stated,"'seains or incipient flaws:

` and as each set of -feeddevice's is constructed in the tubes aredeveloped in the initial drawing process, and must be ground out beforeredrawing the tubes. These seams or flaws vary indirection and form.Most frequently these flaws are in spiral formation, and suchspirali-aws .may be substantially regular for any one piece off tubing;but the pitch of the spiral flaws in different tubes usually differ. 'Itis therefore necessary, to enable the machine to act efficiently on allkinds of tubes, that the feed heads be adjustable and capableof not onlyforwarding the tubes longitudinally lpast the grinder, Ibut alsorotating the tubes in accordance with the pitch `of the spiral flawstherein so that asthe tube is -fed past the grinder it will be rotatedmore or less-rapidly according to the spiral pitch of vthe flaws and befed past the grinderat such speed of longitudinal movement and rotarymovement as will 'practically' cause the spiral flaws, of whateverrpitch, to be vpresentedY preferably arranged at Ythe side of the ina.

chine intermediate the two innermost sets of feed heads; the tubehandling machine beingmovable bodily to or from the grinder, or viceversa, so that when a tube is entered in the machine it Amay be broughtinto contact with the grinder .and held in contact therewith while thetube is Vfed longitudinally past the grinder. The grindershould berotated at high speed while the `tube is being lfed therepast, and is incontact Itherewith, sothat it rwill grind away theincipient seams orflaws in the surface ofthe tube. As these flaws are very shallow it doesnot require much ,grinding to obliterate them,

but if they were not obliterated, in the subsequent redrawings of thetube the flaws would tend to deepen and render the tube worthless whenreduced to the desired size.

The feed heads, 62.162 in each set are relatively adjustable .so thatthey can both feed a tube longitudinally and simultanei ously impart. arotary-motion thereto, and they may be adjusted even 'while in Contactwith a tube; and for this purpose the feed heads are preferably madesemisspherical. oi' so relatively shaped, that their axes may beadjusted to different relative angles while the heads still maintaineffective Contact with the tube.

As shown vin Figs. 9 to 13 the heads may be shifted from a position inwhich their axes are in alinement. endto end in the ysaine plane; to `aposition in which their a-Xes are parallel in different planes. 0fcourse theyy may be adjusted to any intermediate position. Vhen adjustedto the positionsshown in Fig. 9 the tube would be fed straight through.without any rotation. V,Inthe position vindicated in F ig. l0 the tubewould bc fed and rotated on its axis at about a 300 spiral. In Fig. 11the tube would be fed and :rotated at about a 4.50 spiral. In Fig. 12the tube Vwould be fed and rotated at about a 60O Spiral; and in Fig. 13the tube would be fed and rotated at about a 900 spiral. Thus byadjusting the relative pitch of 'the heads the opei'ator can` feed thetube and turn the saine so that straight or spiral seams of any pitchoi' contour can be properly presented to the ,grinder as the tube is fedtherepast. Any suitable means ina-y be provided for adjusting these feedheads for the purpose specified.

iTn the machine shown each shaft 7b has a crank arm 'Tf that ispivotally connected to ya link bar 7g; which `in turn is `piifotallyconnected by a link 7h to one arin of a lever 10, that is pivoted at l0aon any suitable support on the frame. Each shaft 17') vhas a crank arm17f pivotally connected to a link 17g that is connected by a link 17 tothelever 10 at the opposite side of the pivot l()el offsaid lever. Thepivotal` connections of links 7h and 17h to the lever 10 are shown asequi-distant from the pivot 10 of lever 10. The lever 10 is operativelyvconnected by a flink l()b to a longitudinally movable slide barlOCAmounted in a suitable guide 1G in thefranie. Bar l()c has a rack 10dwhich mesheswith a pinion 11e on a shaft ll suitably mounted in theframe and operable by a hand wheel 11a. This hand vwheel is preferablyarranged adjacent the drive so that the operator `can easily Vcontrolthe speed of the drive shaft Q, by manipulating the lever 3,.and also byturning rthe hand wheel 11a.

O Apemtz'on.

When itis desired to grind a tube themachine and grinder are properlyjuxtaposed so that the grinder will be in position to operate upon`thetube as it is fed therepast Y by the'machine. The pressing levers 8 areproperly adjusted relative to the feed heads 6, 16e to suit the size oftube to'he operated upon.'.fThe operator then sets off the pressing'levers 8 fromthe two sets of heads '66,

16e at the incoming end of the machine andrk enters' the end of a tube Tbetween such heads and the pressing levers, and then sets up thepressing levers so as to hold the tube f cause the tube to be fed pastthe grinder at the desired rate of speed and with such a twisting orrotating movement as will cause thetube to present thespiralliavvs-therein to the grinder. The Voperator can vary the "the tube, byladjusting the relative inclinationof the opposed feed heads/in eachpair or unit, as above explained.

To facilitate the 'adjustment of the heads while in engagement with the`pipe, each head is preferably so connected vwith its shaft as to permita partial relative rota tion between the head and its shaft, asindicated in Figs. 7 and 8; for the reason that to adjust the heads inone direction they must be shifted in the directionfin lwhich they arerotating; and to adjust them in the other direction they must be shiftedcontrary to the direction iir which they are tion the latter adjustmentis facilitated.

As thet-u'bes are usually long and'prcferably straight I prefer to havethe tube operatively held by only two sets of the feed heads at atime;thus, if the tube is entered between the rst two sets, at the right inFig. l, then after its end has 'engaged the third set'of feed' heads thepressing lever of the first set'of feed headsfcan be releasedbyshifting' its controlling lever 18e and leaving the tube under controlof the two intermediatesets of feed heads; and then when the tube endenters the fourth set of feed heads the pressing lever of the second setof feed heads may be released. This will lessen strain onthe machine'and facilitate the treatment of slightly bent tubes.

The'maehine can be operated rapidly and efliciently, and will 'greatlyfacilitate the operation of grinding the tube; save time and labor insuch operation, and produce better results..

It will be seenthat the operator has the work always under hisdirectconti'ol; and ,that the tube is positively held vand fedto thegrinder by mechanism always under the control of the operator, and thelabor ina grinder, means` for feeding a'tube Ylongitudinally past the'grinder'and rotating on its axis to present spiral flaws in the tube tothe grinder; with means for varying the speed of travel and rotationofthe tube past the grinder during grinding operation.'V

2. In combination with ,a grinder, means for feeding a tubelongitudinallypast the Vcoaclting feed heads-means for holding atu'be fgrinder and IIieansv for4 simultaneously rotaitinl the tube on'its airisso that the grinder `can ollow lspiral flaws in the'tube; w-ith manuallycontrolled means for varying the Y speed of travel and rotation of thetube past the grinder during the grinding operation. In a machine for'presenting tubes to grinding mechanism, etc., means yfor feeding a-tubelongitudinally past the grinder, and means for simultaneously rotatingit on its' axis to presentspiral flaws in the tube to th'e grinder; withmanually controlled means for varying the travel and'rotation of thetube past the grinder. f y V' 4. In a machine forpresenting tubes to.agrinder, semi-spherical feed heads'adapted to both feed a tubelongitudinally multaneously rotate the tube.A

5. vIn' combination, a grinder, and adjustable feed heads adapted toboth a tube rotating. By mounting the heads on their shafts so as topermit partial relative rotalongitudinally past thegrinder andsimulltaneously rotate the tube andmeans for ad-A justing the heads during'agrinding opera- .both feedl a tube longitudinally and simultaneouslyrotate the tube; with means for 'Y vadjusting the heads atv varyingangles to the tube during a grinding operation to vary the speed of feedand-rotation of the tube.

7 In combination, a grinderg'feed heads l adapted'toboth feed a.tube'longitudinally pastk the' grinder' and simultaneously rotate thetube; and manually operable means for adjusting the heads to vary theIspeed yof feed and' rotation of the tube.`

- 8. In a machine for presenting tubes to grinding mechanism, the:combination of sets of related rotatable feed heads adapted to bothfeed a tube longitudinally past the grinder and simultaneously rotatethe tube;

with manually operable means 'for adjusting the heads at varying anglesto the tube. i

9. In combination, a grinder; feed 'heads adapted to both feed a tubelongitudinally past the grinder and simultaneously rotate the tube; andmeans for adjusting the heads while in contact with the tube, to varythe V speedof feed and rotatioirof the tube, at varying angles to'. thetube.

10.V In a'machine for presenting Itubes to grinding mechanism; thecombination of a plurality of sets of coacting feed heads, means foradjusting theV heads to vary 4the -feedof the tube during aigrindingfopei'ation, means for rotating the heads, and means'for holdinga Vtubejin frictional con-V tact with said heads. 1 -f 1l. Incombination, opposed coacting feed heads, means'for holding a tube infrictional contact with said heads;fmeans1 for rotating the vheadsontheir axes; and vmeans for'adjusting` the heads at varying angles tothe tube.

'12. In combination, a grinder opposed 4in frictional Yc'ont'actwith''said-'heads ;`A means iio Vadapted tol frictionally engage a tube;nieans A for rotating the heads onltheir axes', inea-iis kio forholdinga tube in frictional contact with said heads; and manuallyoperable means for adjusting the headsat varying angles to the tube. i

1,4. In a machine for .they purpose speciiied, feed heads adapted toengagea tube, means for rotating the heads, a lever for holding a tubein frictional contact with said heads; and means` for adjusting saidlever.

15. In combination, opposed coacting feed heads adapted to frictionfallyengage a tube, means for rotating the heads, a lever for holding a tubein frictional contact with said heads; manually controlled means foradjusting said lever, and manually operable means for adjusting the'heads at varying angles to the tube to vary thespeed of'feed andVrotation of thev tube.

16. In combination, a. plurality. ofr sets .of coactiiig feed headsadapted to frctionally engage a pipe or rod; .means forrotating theheads on theiraxes; a lever vadjacent each pair of vheads for holding atube in frictional contact therewithgnieans for adjusting said levers,and means for adjusting the heads at varying angles to the tubes,substantially as described.

' 17. In a machine for the purpose specified,

,the combination of a plurality of sets of opposed coacting feed headsadapted vto frictionally engage a pipe or rod; nieansfor `rotating theheads on.their axes; a lever adjacent eachv pair of heads for yieldinglyholding a tube in frictional contact therewith; manually vcontrolledmeans for adjusting said levers; and manually controlled V`tively.stationarily mounted driving gears and flexible driving connectionsbetween the said driving gears and the gears on the shafts. f

19. In combination, a pair o-f similar but opposite feed heads, arotatable shaftcarr-y- `ing eacli head, a gear on each-shaft, adjustablebrackets supporting said shaft, arms 'connected with said brackets,slidable `bars connected with said arms, 'andmeans-for simultaneouslykfoperating ,said bars `so as ,-to adjust the @heads to different angles.

20. In combination, a pair of similar but opposite feed heads, arotatable shaft carrying eacliliead, a gear oneach shaft, adjustablebrackets supporting said shaft, arms connected with said brackets,slidable bars connected `with said arms, and means forsimultaneously,operating said bars so as to adjusttlie heads todifferent angles; with driving gears and flexible driving connectionsYbetween l,the said `driving gears Vand the gears on the shaftsof .thefeed. heads.

21. In a macliineof -the character described, a seini-spherical feedhead, a shaft on which thishead is mounted, and mea-ns for permittingpartial relative rotation between the shaft and the head.

22. In a machine of the character described, a semi-spherical -feedhead, a shaft onwhich this head isinounted, and means for permittingpartial relative rotation between the shaft and thehead; Vwith ineansadjusting the toggle to oscillate the lever Y.

on its fulcrum.

24. In a machine of the character specilied, a. pressinglhead, vananti-friction selfadjusting device pivot-ally connected with the headand adapted to engage the work,

and means for adjusting theheadto press the device againstthe objectbeingoperated upon. ,g

25. In a machine ofthe character specilied, tube feeding means,.a-presser, an antifriction self-adj usting device connected withthepresser adapted to engage thework. and means for adjustingvtliepresser so vas to hold thedevice in Contact with the tube.

26. In a machine of the character specitied, a pair of feed beads', apresser lever` an anti-friction roller, a support for said rollerpivotally connected ywith the lever;

TFO

and means .for adjusting the lever to cause the anti-friction roller toj'hold a tube in contact with the head.

27. In a machine of the character specified, the combination of a drivenshaft, upper and lower gears on said shaft, upperl and lower feed heads,shafts respectively carrying said feed heads, and y gearing between theupper and lower feed. heads and yupperand lower gears on the drivenshaft.

28. In a machine of the character specified,

the combination of a driven shaft, upper and lower Ygears gon said-`Shaft, .upper and v lower feedlheads shafts respectively carrying saidlfeed heads, and .gearing between the upper andilower feed headsandupper and lower sears 0n theA .driven vShaft iirthmeavs whereby the saidheads may be adjusted to various relative positions while maintainingtheir geared connection.

29. In a machine of the character specified, the combination of a drivenshaft, upper and lower gears on said driven shaft, upper and lo-wer feedheads, shafts respectively carrying said heads, and connections betweenthe gears on the said head shafts and the gears on the drivenV shaft,said connections permitting swinging movements of the heads relativelyto the driven shaft.

30. In a machine of the character specified, the combination of a drivenshaft, upper and lower gears on said shaft, upper and lower feed heads,shafts respectively carrying said heads; swingable supports in whichsaid head shafts are journaled; connections between the gears on thesaid head shafts and the gears on the driven shafts, said connectionspermitting rocking movement of the heads, and means for adjusting saidswingable supports to vary the positions of said heads.

3l. In a machine of the character specie` fied, the combination of adriven shaft, upper and lower gears on said shaft, upper and lower feedheads, shafts respectively carrying said feed heads, and gearing betweenthe upper and lower feed heads and upper and lower gears on the drivenshaft; with an adjustable presser lever adjacent the heads, a toggle forthrowing the lever into or out of operative position; manuallycontrolled devices for operating said toggle, and .manually controlleddevices for adjusting the relative position of the heads.

32. In a machine of the character specilied,V the combination of adriving shaft, a series of gears thereon, a series of counter shaftsrespectively geared to the gears on the driving shaft, upper and lowergears on said counter shafts, pairs of upper and lower feed heads,shafts respectively carrying said heads, and gearing between each pairof upper and lower feed heads and upper 'and lower gears on the relatedcounter shaft.

33. In a machine of the character specified, the combination of adriving shaft, a series of gears thereon, a series of counter shaftsrespectively geared to the gears on the driving shaft= upper and lowergears on said counter shafts, pairs of upper and lower feed heads',shafts respectively carrying said heads, and gearing between each pairof upper and lower feed heads and upper and lower gears on the relatedcounter shafts; with means whereby the said headsy may be adjusted tovarious relative positionsk while maintaining their geared connection.

34. In a machine of the character specified, the combination of adriving shaft, a series of gears thereon, a series of counter shaftsrespectively geared to the gears on the driving shaft, upper and lowergears on said counter shafts, pairs of Lipper and lower feed heads;shafts respectively carrying said heads; and connections between thegears on the said head shafts and the gears on the related countershafts, saidconnections permitting rocking movements of the heads.

35. In a machine of the character specified, the combination of adriving shaft, a. series of gears thereon, a series of counter shaftsrespectively geared to the gears on the driving shaft, upper and lowergears on said counter shafts, pairs of upper and lower feed heads;shafts respectively carrying said heads; swingable supports in, whichsaid head shafts are journale-d, means for adjusting 'said swingablesupports to vary the relative positions of said heads; and connectionsbetween the gears on the said head shafts and the gears on the relatedcounter shafts, said connections permitting series of gears thereon, aseries of counter shafts respectively geared to the gears on thedrivingshaft, upper and lower gears on said counter shafts, pairs of upper andlower feed heads, shafts respectively carrying said'heads, and gearingbetween each pair of upper and lower feed heads and upper and lowergears on the related counter shaft; with an adjustable presser leveradjacent each pair of heads, a toggle for throwing each lever into orout of operating position; manually controlled devices for operatingeach toggle; and manually controlled devices for adjusting the relativeposition of the feed heads.

In testimony that I claim the foregoing as my own, I affix my signature.

f JOSEPH E. HOLBEIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner o'f Patents,

Washington, D. C.

